/Engine/Source/Runtime/Landscape/Classes/LandscapeInfo.h
Moves all Splines to target Proxy. Creates ULandscapeSplineComponent if needed
void MoveSplinesToProxy ( [ULandscapeSplinesComponent](API\Runtime\Landscape\ULandscapeSplinesComponent) * InSplineComponent, [ALandscapeProxy](API\Runtime\Landscape\ALandscapeProxy) * InLandscapeProxy )